Italy
Visit the very beautiful karstic site of '''Rammang-Rammang''' (UNESCO world heritage); count 1h by motorbike from Makassar airport. There, you should rent a boat (200,000Rp for 4 persons) to reach the actual site.
Listen to the audio guide for Rammang-Rammang Free on WIP — starts by itself when you arrive, even with the screen off